SG Heritage Dictionary

Lingula [Noun] Webster's Dictionary 1913

1. A tonguelike process or part.

2. Any one of numerous species of brachiopod shells belonging to the genus Lingula, and related genera. See Brachiopoda, and Illustration in Appendix.

Lingulate [Adjective] Webster's Dictionary 1828

Shaped like the tongue or a strap. [But ligulate is more generally used.]

Lingulate [Adjective] Webster's Dictionary 1913

Shaped like the tongue or a strap; ligulate.